MQT DDSIM - A quantum circuit simulator based on Decision Diagrams

MQT DDSIM is an open-source C++20 and Python library for classical quantum circuit simulation developed as part of the Munich Quantum Toolkit (MQT).

This documentation provides a comprehensive guide to the MQT DDSIM library, including installation instructions, a quickstart guide, and detailed API documentation. The source code of MQT DDSIM is publicly available on GitHub at munich-quantum-toolkit/ddsim, while pre-built binaries are available via PyPI for all major operating systems and all modern Python versions. MQT DDSIM is fully compatible with Qiskit 1.0 and above.

User Guide

• Installation
• Quickstart
• Simulators
• Qiskit Primitives
• References
• Changelog
• Upgrade Guide

Developers

• Contributing
• AI Usage Guidelines
• Tooling
• Support

Python API Reference

• mqt.ddsim

C++ API Reference

• File list

Contributors and Supporters

The Munich Quantum Toolkit (MQT) is developed by the Chair for Design Automation at the Technical University of Munich and supported by the Munich Quantum Software Company (MQSC). Among others, it is part of the Munich Quantum Software Stack (MQSS) ecosystem, which is being developed as part of the Munich Quantum Valley (MQV) initiative.

Thank you to all the contributors who have helped make MQT DDSIM a reality!

The MQT will remain free, open-source, and permissively licensed—now and in the future. We are firmly committed to keeping it open and actively maintained for the quantum computing community.

To support this endeavor, please consider:

• Starring and sharing our repositories: https://github.com/munich-quantum-toolkit

• Contributing code, documentation, tests, or examples via issues and pull requests

• Citing the MQT in your publications (see References)

• Using the MQT in research and teaching, and sharing feedback and use cases

• Sponsoring us on GitHub: https://github.com/sponsors/munich-quantum-toolkit